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OpenBoard/src/adaptors/UBThumbnailAdaptor.cpp

160 lines
4.0 KiB

#include "UBThumbnailAdaptor.h"
#include <QtCore>
#include "frameworks/UBFileSystemUtils.h"
#include "core/UBPersistenceManager.h"
#include "core/UBApplication.h"
#include "core/UBSettings.h"
#include "document/UBDocumentProxy.h"
#include "domain/UBGraphicsScene.h"
#include "UBSvgSubsetAdaptor.h"
UBThumbnailAdaptor::UBThumbnailAdaptor(QObject *parent)
: QObject(parent)
{
// NOOP
}
UBThumbnailAdaptor::~UBThumbnailAdaptor()
{
// NOOP
}
QList<QPixmap> UBThumbnailAdaptor::load(UBDocumentProxy* proxy)
{
QList<QPixmap> thumbnails;
if (!proxy || proxy->persistencePath().size() == 0)
return thumbnails;
//compatibility with older formats (<= 4.0.b.2.0) : generate missing thumbnails
int existingPageCount = proxy->pageCount();
QString thumbFileName = proxy->persistencePath() +
UBFileSystemUtils::digitFileFormat("/page%1.thumbnail.jpg", existingPageCount);
QFile thumbFile(thumbFileName);
if (!thumbFile.exists())
{
bool displayMessage = (existingPageCount > 5);
int thumbCount = 0;
for(int i = 0 ; i < existingPageCount; i++)
{
UBGraphicsScene* scene = UBSvgSubsetAdaptor::loadScene(proxy, i);
if (scene)
{
thumbCount++;
if (displayMessage && thumbCount == 1)
UBApplication::showMessage(tr("Generating preview thumbnails ..."));
persistScene(proxy->persistencePath(), scene, i);
}
}
if (displayMessage && thumbCount > 0)
UBApplication::showMessage(tr("%1 thumbnails generated ...").arg(thumbCount));
}
//end compatibility with older format
bool moreToProcess = true;
int pageCount = 0;
while (moreToProcess)
{
pageCount++;
QString fileName = proxy->persistencePath() +
UBFileSystemUtils::digitFileFormat("/page%1.thumbnail.jpg", pageCount);
QFile file(fileName);
if (file.exists())
{
QPixmap pix;
pix.load(fileName);
thumbnails.append(pix);
}
else
{
moreToProcess = false;
}
}
return thumbnails;
}
void UBThumbnailAdaptor::persistScene(const QString& pDocPath, UBGraphicsScene* pScene, const int pageIndex, const bool overrideModified)
{
QString fileName = pDocPath + UBFileSystemUtils::digitFileFormat("/page%1.thumbnail.jpg", pageIndex + 1);
QFile thumbFile(fileName);
if (pScene->isModified() || overrideModified || !thumbFile.exists())
{
qreal nominalWidth = pScene->nominalSize().width();
qreal nominalHeight = pScene->nominalSize().height();
qreal ratio = nominalWidth / nominalHeight;
QRectF sceneRect = pScene->normalizedSceneRect(ratio);
qreal width = UBSettings::maxThumbnailWidth;
qreal height = width / ratio;
QImage thumb(width, height, QImage::Format_ARGB32);
QRectF imageRect(0, 0, width, height);
QPainter painter(&thumb);
painter.setRenderHint(QPainter::Antialiasing, true);
painter.setRenderHint(QPainter::SmoothPixmapTransform, true);
if (pScene->isDarkBackground())
{
painter.fillRect(imageRect, Qt::black);
}
else
{
painter.fillRect(imageRect, Qt::white);
}
pScene->setRenderingContext(UBGraphicsScene::NonScreen);
pScene->setRenderingQuality(UBItem::RenderingQualityHigh);
pScene->render(&painter, imageRect, sceneRect, Qt::KeepAspectRatio);
pScene->setRenderingContext(UBGraphicsScene::Screen);
pScene->setRenderingQuality(UBItem::RenderingQualityNormal);
thumb.scaled(width, height, Qt::KeepAspectRatio, Qt::SmoothTransformation).save(fileName, "JPG");
}
}
QUrl UBThumbnailAdaptor::thumbnailUrl(UBDocumentProxy* proxy, const int pageIndex)
{
QString fileName = proxy->persistencePath() +
UBFileSystemUtils::digitFileFormat("/page%1.thumbnail.jpg", pageIndex + 1);
return QUrl::fromLocalFile(fileName);
}